Police said the video was taken after the suspect ran Davison off the road and is returning southbound to Davison's vehicle, which was stuck in the median, just moments before the fatal shots were fired.

“You watch the video. You see the timer going on the bottom of the video and you know that that truck is slowing down and that person is going to shoot my son and that countdown is the countdown of his life. That’s hard,” Theresa Alloca, Davison’s mother, said.

Alloca first saw the surveillance video last week in Pennsylvania before police released it publicly. She said she’s hoping the newly released information will help jog someone’s memory.

State police said they believe that several motorists traveling on Interstate 81 saw Davison's car in the median and the suspect's car in the area.

Police have also released the call to 911 Davison made that night. Alloca said she can’t bring herself to listen to the audio recording.

In the call, the dispatcher asked, “You’re the one that called about the Ford Ranger, right?”

Davison responded, “Yeah, yeah, yeah, the one that just hit me.”

“What do you mean? They hit you with the car?” the dispatcher asked.

“Yeah, he smashed me with the car. He pushed me across the median,” Davison said.

Alloca described her oldest child as a hard worker who loved to have fun outdoors on the weekends. She said he was loving and not the kind of person to be involved in a road-rage incident. Davison didn’t like guns; he had the phrase “all the arms we need” tattooed across his back and shoulders.

Davison was headed back to Maine from Florida when he was killed after visiting his sister.

“We kind of focus on Pennsylvania, but that’s where the end of the story was, but we really need to focus on the beginning,” Alloca said. She believes the road-rage incident began in Virginia and continued as her son drove through West Virginia and Maryland before crossing into Pennsylvania. She hopes publicity and social media will help this story reach someone who can help police solve the case.

“Someone knows something and we just need them to come forward,” she said.

Anyone with information is asked to call the PA Crime Stoppers Tip Line at 1-800-4PA-TIPS.

All callers remain anonymous and could be eligible for a cash reward up to $10,000, police said.

INVESTIGATORS ARE RELEASING NEW EVIDENCE TONIGHT IN THEIR EFFOR TO FIND THE PERSON WHO SHOT AND KILLED A MAINE MAN ON A PENNSYLVANIA HIGHWAY BACK IN JANUARY. POLICE SAY THE SURVEILLANCE FOOTAGE SHOWS THE KILLER GETTING OFF THE HIGHWAY TO HEAD BACK AND CONFRONT ASTI DAVISON. W-M-T-W NEWS EIGHT'S PAUL MERRILL SPOKE WITH DAVISON'S MOTHER TODAY. PAUL JOINS US NOW LIVE WITH HER STORY.. PAUL. THERESA ALLOCA IS WAITING FOR THE NEWS THAT POLICE HAVE TRACKED DOWN THE PERSON WHO SHOT AND KILLED HER SON. SHE AND INVESTIGATORS ARE HOPING ANY EVIDENCE THEY RELEASE WILL HELP JOG SOMEONE'S MEMORY AND LEAD TO AN ARREST. PENNSYLVANIA STATE POLICE SAY THIS FOOTAGE FROM A CAR LOT SECURITY CAMERA SHOWS THE SUSPECT'S VEHICLE GETTING OFF I-81 TO GO áBACKá TO THE SPOT WHERE TIMOTHY AUSTIN DAVISON'S CAR WAS STUCK IN THE MEDIAN AFTER BEING RUN OFF THE ROAD. 12:26:10- 12:26:36 Theresa Alloca/Asti's Mother: "You watch the video. You see the timer going on the bottom of the video and you know that that truck is slowing down and that person is going to shoot my son and that countdown is the countdown of his life. That's hard." THERESA ALLOCA IS ASTI'S MOTHER. SHE FIRST VIEWED THE SURVEILLANCE FOOTAGE LAST WEEK IN PENNSYLVANIA BEFORE POLICE RELEASED IT PUBLICLY TODAY. THERESA STILL CAN'T BRING HERSELF TO LISTEN TO THE AUDIO POLICE RELEASED LAST MONTH OF HER SON'S NINE-ONE-ONE CALL. Dispatcher: "OK. Were the one that called about the Ford Ranger, right?" Davison: "Yeah, yeah, yeah, the one that just hit me." Dispatcher: "What do you mean? They hit you? Hit you with the car or...?" Davison: "Yeah, he smashed me with the car. Pushed me across the median." THERESA DESCRIBES HER OLDEST CHILD AS A HARD WORKER WHO LOVED TO HAVE FUN OUTDOORS ON THE WEEKENDS. THE 28-YEAR-OLD WITH THE UNIQUE NICKNAME WAS LOVING AND HIS MOTHER SAYS NOT THE TYPE TO INITIATE A ROAD RAGE INCIDENT. HE DIDN'T LIKE GUNS AND HAD THE PHRASE "ALL THE ARMS WE NEED" TATTOOED ACROSS HIS BACK AND SHOULDERS. ON JANUARY 4TH, ASTI WAS HEADING HOME TO POLAND AFTER VISITING WITH HIS SISTER IN FLORIDA. 12:30:15- 12:30:21 Theresa Alloca/Asti's Mother: "We kind of focus on Pennsylvania, but that's where the end of the story was, but we really need to focus on the beginning." THERESA BELIVES THE ROAD RAGE INCIDENT BEGAN IN VIRGINIA AND CONTINUED AS HER SON DROVE THROUGH WEST VIRGINIA AND MARYLAND BEFORE CROSSING INTO PENNSYLVANIA. SHE'S HOPING PUBLICITY AND SOCIAL MEDIA WILL HELP THIS STORY REACH SOMEONE WHO CAN HELP POLICE SOLVE THE CASE. 12:31:11-12:31:14 Theresa Alloca/Asti's Mother: "Someone knows something and we just need them to come forward." SNIPE HERE IS A PICTURE OF A TRUCK LIKE THE ONE POLICE ARE LOOKING FOR. IT'S A 1993-1997 DARK LAPIS BLUE FORD RANGER PICK- UP TRUCK THAT INVESTIGATORS THINK SUSTAINED DAMAGE TO THE DRIVER'S SIDE. IF YOU THINK YOU KNOW SOMETHING OR KNOW SOMEONE WHO KNOWS SOMETHING, WE'VE PUT INFORMATION ABOUT SUBMITTING TIPS ON OUR WEB SITE: W-M-T- W-DOT-COM. LIVE IN THE STUDIO, PAUL